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avcodec/tiff: Check the linearization table size 

Fixes: out of array access
Fixes: 24604/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-4843529818603520

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-08-19 23:21:21 +02:00
parent 649a6969f7
commit 7577f8332a
1 changed files with 3 additions and 1 deletions
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4
libavcodec/tiff.c
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@ -1434,7 +1434,9 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
s->sub_ifd = ff_tget(&s->gb, TIFF_LONG, s->le); /** Only get the first SubIFD */
break;
case DNG_LINEARIZATION_TABLE:
for (int i = 0; i < FFMIN(count, 1 << s->bpp); i++)
if (count > FF_ARRAY_ELEMS(s->dng_lut))
return AVERROR_INVALIDDATA;
for (int i = 0; i < count; i++)
s->dng_lut[i] = ff_tget(&s->gb, type, s->le);
break;
case DNG_BLACK_LEVEL: